我开发的音频播放器的Andr​​oid。所以我想添加播放的歌曲，即艺术家名称，时间，比特率和采样频率的细节。 我能得到艺术家名字和音乐文件的时间使用 MediaStore.Audio.Media库。但我无法得到比特率和同一个文件的采样频率。所以，我怎么可以得到相同的？

I am developing audio player in android. So i want to add the details of the playing song i.e. Artist Name, Duration, Bit rate and sampling frequency. I can get Artist Name and duration of a music file by using MediaStore.Audio.Media library. But i am unable to get Bit rate and sampling frequency of the same file. So how can i get the same?

据我所知，它可以通过使用本机库完成。但不知道怎么样？所以，任何人都可以帮助我在这？

As i know, it can be done by using native library. But don't know how? So anyone can help me on this?

推荐答案

您可以通过将文件大小在几秒钟内音频的长度，例如，从随机AAC连接codeD M4A在接近它我库：

You can approximate it by dividing the file size by the length of the audio in seconds, for instance, from a random AAC encoded M4A in my library:

File Size: 10.3MB (87013064 bits)
Length: 5:16 (316 Seconds)
Which gives: 87013064 bits / 316 seconds = 273426.147 bits/sec or ~273kbps
Actual Bitrate: 259kbps

由于绝大多数的音频文件都有一组已知的有效比特率的水平，你可以用它来踩比特率的适当水平的显示。

Since most audio files have a known set of valid bitrate levels, you can use that to step the bit rate to the appropriate level for display.